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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash Flows from Operating Activities:      
Net income $ 158,027 $ 205,435 $ 265,895
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 163,973 156,298 151,217
Amortization of financing costs 712 648 772
Amortization of net gain on treasury lock (1,846) (1,846) (1,846)
Share-based compensation expense 9,736 7,006 7,261
Deferred income tax provision 27,347 (120,579) (13,819)
Loss on disposals of property, plant and equipment 7,137 8,865 6,605
Alternative fuel mixture tax credits receivable   127,811 (127,811)
(Increase) decrease in assets -      
Accounts receivable (16,946) (50,256) 13,602
Inventories (8,333) (28,352) (5,498)
Prepaid expenses and other current assets (616) (3,956) (9,458)
Increase (decrease) in liabilities -      
Accounts payable (694) 25,367 22,475
Accrued liabilities 6,052 11,254 4,764
Other, net 965 12,225 (8,028)
Net cash provided by operating activities 345,514 349,920 306,131
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (280,213) (320,200) (114,197)
Additions to other long term assets (13,055) (2,627) (2,105)
Acquisition of businesses, net of cash acquired (57,340)   (3,136)
Proceeds from disposals of property, plant and equipment 443 1,513 114
Net cash used for investing activities (350,165) (321,314) (119,324)
Cash Flows from Financing Activities:      
Proceeds from long-term debt 150,000      
Payments on long-term debt (670) (626) (606)
Financing costs paid (2,041)      
Settlement of treasury lock 9,910      
Common stock dividends paid (76,012) (61,798) (76,898)
Repurchases of common stock (125,027) (38,901)  
Proceeds from exercise of stock options 7,016 7,496 1,615
Excess tax benefits from share-based awards 1,232 1,052 412
Net cash used for financing activities (35,592) (92,777) (75,477)
Net decrease in cash and cash equivalents (40,243) (64,171) 111,330
Cash and cash equivalents, beginning of year 196,556 260,727 149,397
Cash and cash equivalents, end of year $ 156,313 $ 196,556 $ 260,727